Magnetic collector for grinder



May 5, 1970 H. QJACOBSON ET L 3,510,072

MAGNETIC COLLECTOR FOR GRINDER Filed Jan. 8, 1968 2 Sheets-Sheet 1 FIE..2 66 6 7 20 /\-[3 MRS flow/m0 6'- 11960550 ROBERT J? 0150 92 [3 Y FIE:.2 2

- flrrokms y 1970 H. c. JACOBSON ErAL 3,510,072

MAGNETIC COLLECTOR FOR GRINDER Filed Jan. .8, 1968 2 Sheets-Sheet 2 12 15? 424 iii: 1

39 V I 3/ 36 MM /1;; m you/Ana c. $460850 Y ROBERT z? OZSOIV United.States Patent O 3,510,072 MAGNETIC COLLECTOR FOR GRINDER Howard C.Jacobson, 1484 Branston Ave., St. Paul, Minn. 55108, and Robert P.Olson, Rte. 2, Box 657, Mound, Minn. 55364 Filed Jan. 8, 1968, Ser. No.696,305 Int. Cl. 1302c 13/282 US. Cl. 24173 3 Claims ABSTRACT OF THEDISCLOSURE An apparatus consisting of a magnetic member mounted onto awall portion of the grinding chamber of a hammer mill, said magneticmember including a collector whereby metallic particles are withdrawnfrom feed material being processed within said chamber, said particlesbeing retained by said collector.

BACKGROUND AND SUMMARY OF THE INVENTION Particular reference is had to ahammer mill type of grinder processing various types of animal feedsincluding silage material. It is not uncommon for silage material andother feed grains stored or accumulated on a farm to be ground for feedto have metallic particles therein which may come from various sourceson a farm and may be inadvertently picked up off the ground. Metallicparticles in the grinding process caused damage to the hammers and maybecome so hot as to become a source of combustion. It is not unusual forsuch particles to start fires within the grinding chamber, spouts orbins.

Various means are used to remove metallic particles from the feedingredients being processed within the v grinder. No knowledge is had ofan apparatus or device operating directly in connection with thegrinding chamber of a mill to remove metallic particles with thecommencement of the processing of the material therein.

It is an object of this invention therefore to provide simple andefiicient means to remove metallic particles from feed material in theprocessing chamber as in a hammer mill.

It is another object of this invention to provide a magnetic membermounted onto the enclosure of a grinding chamber of a mill having meanswithin said chamber to retain metallic particles attracted thereto.

More specifically it is an object of this invention in connection withthe grinding chamber of a hammer mill to provide a magnetic assemblycomprising a magnet mounted onto a supporting plate and adapted to beremovably mounted over a suitable opening within the screen enclosure ofsaid chamber whereby material being processed therein passessufficiently close to said magnetic assembly to have metallic particleswithin said material effectively withdrawn therefrom and retained bysaid magnetic assembly.

These and other objects and advantages of the invention will be setforth in the following description made in connection with theaccompanying drawings in which like reference characters refer tosimilar parts throughout the several views and in which:

FIG. 1 is a broken view in front elevation of a grinding chamber;

FIG. 2 is a fragmentary perspective view on a magnified scale showingdetailed construction of the invention herein;

FIG. 3 is a broken view in front elevation of a modification of theinvention herein; and

FIG. 4 is a view in front elevation showing another modification of theinvention herein with an alternate portion of a portion thereof beingshown in dotted line.

3,5Wfi72 Patented May 5, 1970 DESCRIPTION OF A PREFERED EMBODIMENTReferring to FIGS. 1 and 2, a housing portion 10 of a feed mill isshown. No more supporting structure than this is believed necessary tobe shown for an adequate disclosure of the subject matter of theinvention herein. The invention may be adapted for use with varioustypes of mills for grinding and/or processing material. The invention ishere shown in connection with a conventional type of a hammer mill.

Said housing 10 comprises a front wall 12 having a cover opening 13therein, a rear wall 15, side walls 17 and 18, a top wall 20, and asupporting base 23. Dis charge means from said base are not here shown.The cover which is not here shown will be supported by hinges 25 carriedon the leading edge of the side wall 18, and latching members 26 forsaid cover are indicated on the leading edge portions of the side wall17.

Carried on the rear wall 15 as by being welded thereto and extendingforwardly therefrom is a flange 30 supporting the rear side wall edgeportion of a screen assembly to be described. Said flange in theembodiment here presented defines the form of a tear drop in plan. Theapex or upper portion of said flange is formed by an inverted V-shapedplate member 32 which is the full width of said screen assembly andsubstantially the full width of the interior of said housing 10. Saidmember 32 also is suitably secured to said rear wall as by welding.

Said screen assembly 35 comprises a screen 36 of suitable mesh havingits inner edge portion disposed about and supported by said flange 30.Said screen stops short of the apex portion of said flange and terminalplate portions 36a overlying the adjacent end portions of said member32.

Overlying said screen to hold the same in operating position is arectangular frame member 39 of like width and having suflicient lengthto have its identical end portions 39a and 39b overlie the respectiveadjacent end portions of said plate member 32.

Said end portion 39a is formed to comprise a pair of laterally spacedaxially apertured ears or hubs 39c having a shaft 40 journaledtherethrough. A pair of spaced hangers 42 have hubs 42a formed at theirlower ends to have said shaft disposed therethrough and have their upperends 42b suitably pivotally secured to a rod 41 cantilevered forwardlyof said rear wall 15. A T-type adjusting screw member has a lowertransverse cylindrical portion 51 between said hangers 42 having saidshaft 40 extend therethrough. The tubular arm 52 of said screw memberextending from said transverse portion is tapped to receive a threadedrod 53 which extends outwardly of the side wall 17 through a hub bearing55 carried by said side wall 17 through a hub bearing 55 carried by saidside wall and in which said rod is rotatably secured and locked fromhaving axial movement. Said rod is rotated by a terminal crank 57.

The end portion 39b is identical to the end portion 3% and has likerelated structural elements and though not specifically described areindicated by like reference numerals with a prime added.

With reference to FIG. 2, the sides and 61 of said inverted V-shapedmember 32 adjacent its apex have rectangular openings therein. Opening64 is shown in the side 61. The corresponding opening in the side 60 ismerely indicated. Respectively overlying said openings are identicalmagnetic assemblies 66 and 67.

It will be understood that said magnetic assemblies may be variouslyformed comprising either electromagnets or permanent type magnets withinthe scope of the invention herein. The magnetic assembly 66 will bedescribed as here presented. Said assembly comprises a rec tangularsupporting plate 69 to overlie the opening in side 60. Said supportingplate has a pair of spaced transverse slots 69a and 69b therein.Underlying said plate 69 and secured thereto as by bolts 75, is anonmagnetic plate member 77. A permanent horseshoe type magnet 79 of asize to have adequate drawing power is shown having its polesrespectively seated in said slots 69a and 69b in engagement with saidunderlying plate 77. Said magnet is secured to said plate 69 by bolts81. The Word magnet is here used in a collective sense to include theindividual magnets shown.

Magnetic assembly 67 is of identical structure as said magnetic assembly66 and is not here described. The magnetic member thereof is indicatedby the reference numeral 79.

At either end of said plate 69 are retaining members comprising bars 84abutting either end of said plate 69 with superposed plate members 85overlying the adjacent edge portions of said plate 69 and having bolts87 pass therethrough and into the underlying plate member to removablysecure said magnetic assembly.

Mounted onto a shaft 90 extending forwardly of said rear wallsubstantially centrally within said screen assembly is a conventionalhammer type grinder assembly consisting of a plurality of circularaxially spaced plate members 92 having rotatable hammers 95 pivotedtherebetween adjacent the peripheries thereof as shown. A cover willoverlie the cover opening and conventionally will have an inwardlyextending flange to underlie and support the adjacent or leading edgeportion of the screen assembly.

OPERATION It is not uncommon for feed material provided from the farmfor processing to contain metal particles of various kinds. Theseconstitute a hazard and are efficiently removed in the operation of theinvention as here described.

Material to be processed will be fed into the grinding chamber in aconventional manner, such as through an opening in the rear wallthereof. The grinding assembly will spin the material about the interiorof the chamber with the hammers 95 mixing and reducing the material to asize to be discharged from the chamber through the screen 36.

In being processed, the material passes sufficiently close to themagnetic assemblies 66 and 67 to have the metallic particles within saidmaterial attracted by the magnets 79 and 79. Said particles are retainedon the underside of the plate members 77 and 77 The hammers 95 have butvery little clearance in their extended positions with respect to thescreen 36. Sufiicient clearance must be provided so that the metallicparticles accumulated onto the plates 77 and 77 will not be disturbed bysaid hammers. The tear drop configuration in plan of the screen assemblyherein disclosed provides such clearance. Thus the processed material iseffectively cleared of metallic particles.

The metallic particles accumulated onto the plates 77 and 77' will beretained thereon throughout any given cycle of processing material. Toremove such particles, the grinder will be stopped. The cover of thegrinding chamber will be removed. A suitable receptacle will be insertedor held beneath the magnetic assemblies and the metallic particles willreadily be scraped off the underlying surfaces of the plates 77 and 77'to be dropped into the receptacle. These steps are not here shown butare indicated to provide a complete description of the operation. Itwill be understood that if electromagnets are used, then they need onlyto be deenergized to have the accumulated metallic particles simply dropinto an underlying held receptacle.

To remove the magnetic assemblies, the bolts 87 need only to be loosenedto loosen the plate members 85 and the entire assemblies may simply bemoved laterally oif of the supporting inverted V-shaped plate member 32.

4 MODIFICATION Referring to FIG. 3, a modification is shown of themagnetic assembly with respect to its mounting onto the screen assembly.Except for the changes noted hereinafter, the structure is identical tothat above described.

The inverted V-shaped member corresponding to the member 32 has noopenings in its sides and is indicated by the reference numeral 99.

The magnetic assemblies and 101 comprise the magnets 79 and 79'respectively secured onto single un derlying plate members 103 and 104and will be secured thereto as by bolts 105.

Here the magnetic assemblies are hinged to the member 99. With referenceto the magnetic assembly 100, a piano type hinge 106 has its flapportion 106a secured as by welding to the upper edge portion of thesupporting plate 103 and its other flap portion 10% with an underlyingspacer 1060 is secured to the upper outer side portion of said member 99adjacent its apex, as shown.

The other or lower end portion of said plate 103 is shown secured by apair of conventional rotatable screw down clips 108, of which only oneis shown.

The magnetic assembly 101 will have an identical arrangement.

In operation, the magnetic assemblies extend their fields through theunderlying supporting member 99 to attract and retain onto theundersurface of said member 99 the metallic particles which arewithdrawn from the material being processed within the grinding chamber.

When it is desired to clean out the accumulated metallic particles, theclips 108 are loosened and rotated 180 degrees. The magnetic assembliesare then swung upwardly to withdraw the force field sufiiciently fromthe underlying surface of the member 99 to have the accumulated metallicparticles drop into a suitable receptacle held thereunder.

Another modification is shown in FIG. 4 in which structure identical towhat has been above described will be indicated by like referencecharacters.

The flange 30 carried on the rear wall 15 instead of having theprojecting inverted V-shaped member 32 at its apex portion has atriangular post 112 cantilevered from said rear wall. The screen 113differs from that previously described in having its upper ends securedtogether by an angled plate member 115 having bolts 116 extendingtherethrough. Said post 112 will the full width of the screen andprovides hanger support for said screen.

The magnetic assemblies 100 and 101 overlie the screen directly as shownat either side thereof adjacent its apex. Here said assemblies are shownsecured by said piano type hinges 106 to hangers 120 which will comprisetransversely spaced pairs for each of said magnetic assemblies. Saidhangers may be suitably secured as by welding to the top 20 of saidhousing.

The operation here is readily obvious from the description of the firstmodification.

Thus it is seen that there has been provided a simple and eflicientapparatus for effectively removing metallic particles from materialbeing processed within a grinding chamber. Said metallic particles arewithdrawn very early in the grinding process of new material enteringthe grinding chamber before any damage can be caused by said particles.This apparatus has proved to be very satisfactory in performance.

It will of course be understood that various changes may be made in theform, details, arrangement and proportions of the parts, withoutdeparting from the scope of the invention herein which, generallystated, consists in an apparatus capable of carrying out the objectsabove set forth, in the parts and combinations of parts disclosed anddefined in the appended claims.

What is claimed is:

1. An apparatus to collect metallic particles in connection with agrinding mill comprising a housing having 6 a grinding chamber thereinhaving grinding means therein said hangers comprising means hinging saidmagnet having in combination, thereto for swinging movement of saidmagnet away an andless screen structure comprising the side wall of fromsaid screen.

said grinding chamber, said screen structure having a greater clearancewith respect to the grinding means 5 References Cited therein at itsupper portion than at the remainder of UNITED STATES PATENTS itsstructure, a non-magnetic plate member insert integral as a part2,276,940 3/ 1942 Dellinger et a1 241-86 of said screen structureadjacent the upper portion 2,293,664 8/1942 Roberts 209-223 thereof andforming a wall portion thereof, and 10 FOREIGN PATENTS a magnetoverlying said plate member. 2. The structure set forth in claim 1,including means securing said magnet, said means comprising a hingeconnecting said magnet ROBERT RIORDON Pnmary Exammer and said screen forupward swinging movement of 15 M. G. RASKIN, Assistant Examiner saidmagnet away from said screen. 3. The structure set forth in claim 1,including U.S. Cl. X.R. a pair of hangers above said magnet dependingfrom 186 said housing, and

174,148 3/1935 Switzerland.

